Topic
Radiation mode
About: Radiation mode is a research topic. Over the lifetime, 4382 publications have been published within this topic receiving 68967 citations.
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TL;DR: In this paper, a 2D photonic crystal waveguide composed of hexagonal lattices of air holes in high index materials is proposed, where light incident into the waveguide is coupled into two modes.
Abstract: We propose a structure of 2D photonic crystal waveguide composed of hexagonal lattices of air holes in high index materials. Frozen mode regime can be observed within the photonic band gap. Light incident into the waveguide is coupled into two modes. One mode has enhanced amplitude and the other one has slow group velocity. Finite-different time-domain (FDTD) simulation is used to demonstrate the propagation of the slow mode.
10 Sep 2002
TL;DR: In this article, the normal facet full vector problem is accurately solved for a vector circular optical fiber with a high efficiency algorithm, and the free space radiation mode (FSRM) method is used to investigate the facet reflectivity for a set of incident modes.
Abstract: The normal facet full vector problem is accurately solved for a vector circular optical fibre with a high efficiency algorithm. The free space radiation mode (FSRM) method is used to investigate the facet reflectivity for a set of incident modes having all six components of electromagnetic field dependent on all three spatial coordinates. The analysis yields a simple integral for the reflection coefficient for each mode, which makes calculations fast and reliable. Vector results for the reflectivity of the fundamental EH/sub 11/ mode are compared with the scalar ones showing significant quantitative differences between them (<40 dB).
Patent•
30 Dec 2014
TL;DR: In this paper, the power of each reader is set into two transmitting modes of coarse-grained radiation and fine grained radiation, and a power energy level mapping function is set up, mapping from the coarse-ground radiation mode to the fine-ground location radiation power sequence within the minimum effective energy level range is achieved.
Abstract: The invention belongs to the technical field of mobile communication, and relates to a radio frequency identification and location method based on intelligent control over power. According to the method, the power of each reader is set into two transmitting modes of coarse-grained radiation and fine-grained radiation, a power energy level mapping function is set up, mapping from the coarse-grained radiation mode to the fine-grained radiation mode within the minimum effective energy level range is achieved, a fine-grained location radiation power sequence is generated to intelligently control the power of the readers, identity cognition sequences of labels to be located in the coarse-grained radiation mode and the fine-grained radiation mode are compared to detect whether the labels to be located are transferred out of a location environment or enter a dead zone, and neighbor reference label cognition sequences of the coarse-grained radiation mode and the fine-grained radiation mode are compared to detect whether path loss characteristics change or not. By improving the power transmitting mode of the existing radio frequency readers, the location efficiency and the location real-time performance can be effectively improved.
TL;DR: In this paper, a planar dielectric waveguide loaded with an infinitely thin perfectly conducting diaphragm is considered and the problem of the guided mode reflection from the end of such a waveguide is analyzed with the help of the integral equation method and the variational method.
Abstract: A planar dielectric waveguide loaded with an infinitely thin perfectly conducting diaphragm is considered. The problem of the guided mode reflection from the end of such a waveguide is analyzed with the help of the integral equation method and the variational method. Dependences of the fundamental mode reflection coefficient on the waveguide parameters and on the dimension of the aperture are calculated.
TL;DR: In this article, the shape of a PVDF sensor is analytically determined in such a way that the output signal of the sensor is directly proportional to amplitude of a particular radiation mode.
Abstract: This paper presents a new strategy for the design of radiation mode sensors by using shaped PVDF films for one-dimension structures. Based on a modal approach, the shape of a PVDF sensor is analytically determined in such a way that the output signal of the sensor is directly proportional to amplitude of a particular radiation mode. Other modes are filtered out. A general expression of the PVDF sensor shape is obtained. It is found that the modal sensor shape can be expressed as a function of the second spatial derivative of the structural mode shape function. Finally, with an example of a vibrating beam, the proposed PVDF radiation mode sensor is used in an active structural acoustic control system for reduction of the structural-borne noise.